Improvement in saw-mills



B. BERNDT. Saw-Miils.

N0. 141,028, Patented .Iuly 22,1873.

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, AM, PHoro-umomfH/c co. Mosamvf's mams) UNITED STATES PATENT EEICEoBERNHARD BERNDT, OF WILLIAMSPORT, PENNSYLVANIA, ASSIGNOR TO RILEY &MAITLAND, OF SAME PLAGE.

IMPROVEMENT IN SAW-MILLS.

Specification, forming part of Letters Patent No. 141,028, dated July22, 1873; application iiled May 29. 1873.

To all whom it may concern: l

Beit known that I, BERNHARD BERNDT, of Williamsport, in the county ofLycoming and State of Pennsylvania, have invented a new and usefulImprovement in Saw-Mills; and I do hereby declare that the following isa full and exact description of the same, reference being had to theaccompanying drawings and to the letters 'of reference marked thereon.

Thisinvention relates to the means employed for communicating the properreciprocating motion to the logcarriage from the main power; andconsists mainly in the combination of an. adjustable plate or block andlever of peculiar construction with sliding boxes, carrying the shaftsof the friction pulleys which communicate motion to the shaft whichactuates, by means of its pinion, the log-carriage, as will be fullydescribed hereinafter.

In the drawings, Figure l represents a plan view of my invention asapplied to a saw-mill; Figs. 2, 3, and 6, Views of various partsdetached 5 and Figs. 4 and 5, views of the friction-drum and thevertically-moving pulleys.

To enable others skilled in the art to make and use my invention, I willnow proceed to describe fully its construction and manner of operation.

A A represent frame-work of any proper construction; B, the saw shaft,turning in suitable bearings, and provided with proper pulleys,` in theusual well-known manner. C

represents the shaft carrying the upper fric-` tion-pulley c, and D,Fig. 2, represents the 'lowershaft carrying the lower friction-pulley d,Figs. 4 and 5, as shown. These shafts are provided with proper pulleysfor receiving power for the sawshaft,`as shown, and are supported at oneend in bearings :v Fig. 1, adapted -to permit suitable vertical movementat the other end to cause either friction-pulley to come in contact withthe pulley upon the shaft which actuates the carriage.

The means employed for moving these shafts verticallyconstitutes myinvention, which will now be described. E represents a guide-block,rigidly bolted to the frame-work, which is provided with suitablegrooves or ways, in which move the sliding block e, having bearings e1for supporting the pulley-shafts, which latter pass through suitableslot-s in the guideblock, as shown. If desired, the sliding block maymove between friction-pulleys, as shown in Fig. 6. e2 represents a platehaving a tongueshaped lug, e3, as shown. It is bolted to the slidingblock c, and by means of slots is made adjustable to compensate forwear. F repA resents a lever having its short arms provided with curvedfingers upon each side, which are adapted to inclose the tongue-shapedlug, as shown. The friction-pulleys are employed in connection with afriction-pulley attached to the shaft, which actuates the carriages inthe usual well-known manner.

The operation will be readily understood. By means of the lever, thesliding block is caused to move vertically, as described, and bring oneor the other of the friction-pulleys in contact with the intermediatepulley which operates the carriage. The tongue shaped lug, by means ofits double curve, is enabled to adapt itself to every movement of thelever.

Having-thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

The combination of the linger-headed lever F, the adjustable plate e2,the sliding block c, and guide-block E, substantially as described.

This specification signed and witnessed this 19thv day of May, 1873.

Witnesses: BERNHARD BERNDT.

M. L. LIGGETT, D. N. ROOK.

